User Guide for the TIMSS International Database.pdf - TIMSS and ...

C H A P T E R 7 D A T A B A S E F I L E S
Information About How the Reported Derived Variables Were Computed
Descriptions of each of the derived variables based on student and teacher background data, their
associated international table/figure references, and analysis notes indicating how they were
computed using the associated student or teacher source variables are provided in Supplement 4
for the following four types of derived variables:
Section 1 Population 1 - Derived variables based on student background data
Section 2 Population 1 - Derived variables based on teacher background data
Section 3 Population 2 - Derived variables based on student background data
Section 4 Population 2 - Derived variables based on teacher background data
Each section of Supplement 4 is presented in alphabetical order by derived variable name. The
documentation for derived variables reflects the rules for construction from the internationally
defined background questions. Due to national adaptations of some items in the background
questionnaires, some countries have been omitted or handled somewhat differently for certain
report variables. Documentation describing how specific national deviations were handled in the
international derived variables is also summarized in Supplement 4 for each of the report
variables. The response option definitions for all derived variables as well as their associated
international report table and figure references also are included in the student and teacher
codebook files, which are described in Section 7.3.
Derived Variables Based on School Background Data
In addition to the derived reporting variables based on the student and teacher background data,
several additional derived variables are included in the school background files for Population 1
and Population 2. These variables are listed below with the questionnaire locations of the school
background variables used to obtain them (SCQ1-**, SCQ2-** = Population 1 or Population 2
School Questionnaire Item Number).
ACDGTENR/BCDGTENR Total school enrollment (sum of boys and girls reported
in SCQ1-16A/SCQ2-17A)
ACDGLTER/BCDGTENR Total lower-grade enrollment (sum of boys and girls
reported in SCQ1-16E/SCQ2-17E)
ACDGLTRT/BCDGLTRT Total students repeating lower grade (sum of boys and
girls reported in SCQ1-16F/SCQ2-17F)
ACDMLTER/BCDMLTER Total lower-grade students studying mathematics (sum
of boys and girls reported in SCQ1-16I/SCQ2-17I)
ACDSLTER/BCDSLTER Total lower-grade students studying science (sum of
boys and girls reported in SCQ1-16J/SCQ2-17J)
ACDGUTER/BCDGUTER Total upper-grade enrollment (sum of boys and girls
reported in SCQ1-16K/SCQ2-17K)
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